Preparation of Silicon Raw Material for Photovoltaic Glass by a Gangue Quartz Ore
With the rapid development of photovoltaic industry,the amount of photovoltaic glass increases substantially,and the high-quality photo-voltaic glass raw materials face shortage,it is necessary to study the purification technology of siliceous raw materials.In this paper,a quartz ore in Fujian province was taken as raw ore,and the mineralogy was studied firstly.Then the process of"grinding grading-self-grinding scrubbing-magnetic separa-tion-acid scrubbing"was adopted to proceed detailed tests on grinding fineness,self-grinding fineness,magnetic intensity,type of acid scrubbing,dosage of acid scrubbing and time of acid scrubbing.The results show that the main impurities in the quartz ore are silk(white)cloud,kaolinite and limonite.After purification by grinding grading and self-friction scrubbing,the content of SiO2 above 99.5%is obtained under the condition of magnetic intensity 1.0 T,oxalic acid dosage 7.5%,acid scrubbing 40 min,liquid solid mass ratio of acid scrubbing 2∶1 and acid scrubbing temperature 25℃.The content of impurities Fe2O3,Al2O3,TiO2 and Cr2O3 reach the first-grade standard of JC/T 2314-2015"silicon raw material for photovoltaic glass quartz concentrate".
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维普
